From a foreign country, you will need to dial 00 and 91 to reach India and 11 for Delhi.

The city has basic landline operators as well as many mobile telephony providers. State-owned MTNL and private enterprises like Vodafone Essar, Airtel, Idea cellular, Reliance Infocomm and Tata Indicom provide telephone and cell phone services in the city.

• MTNL: A government owned service provider with a comprehensive list of services.
• TATA Indicom: A relatively new entrant which is part of the well reputed TATA group.
• Reliance Infocomm: The newest entrant in the market.
• Airtel: Boasts of over two million customers in Delhi.
• Vodafone Essar: Another reputed telephony provider.
• Idea Cellular: This is a leading GSM mobile service operator with pan India licenses.
  

Pre-paid cards

The prepaid SIM card with a world cell phone is a convenient, economical and efficient way to stay in touch while in Delhi. All incoming calls while you travel in India are free. You only pay the local rate for local calls since the SIM card is prepaid, there is no hassle of a contract. You can get a pre-paid SIM card at any mobile shop in Delhi.